Sink-head top



April 10, 1928.

1,665,515 M. R. TREMBOUR SINK HEAD TOP v I Filed Jan. 19. 1926 2Sheets-Sheet 1 I1 In" 'ml v Ill z I QI 'H' "mmlh c/ZR, fiemazzr new I 30usually found satisfactory Patented Apr. 10, 1928.

UNITED STATES MAX R. TBEMIBOUR, F CANTON,

POBATION, OF NEW YORK,

OHIO, ASSIGNOR TO CENTRAL ALLOY STEEL COB- N. Y., A CORPOBATIOFN OF NEWYORK.

SINK-HEAD TOP.

Application filed January 19, 1926. Serial No. 82,209.

The invention relates to sinkhead tops for use on ingot molds for thepurpose of reducing the pipe or shrinkage cavity usually formed iningots during the cooling process in the ingot molds.

Sinkhead tops sometimes include a brick laced upon the top of anordinary cast iron ingot mold, the brick being shaped so as to form anextension of the mold chamber.

As a rule this brick is not purposely heated, but is put on the mold atwhatever temperature the brick may have as a result of 1ts immediateenvironment.

The heat conductivity of the brick walls being lower than that of thecast iron mold,

when molten metal is poured into the ingot chamber to fill the ingot andbrick sinkhead chambers, the metal remains liquid in the sinkheadchamber until the main body in the ingot chamber has. solidified.

Such brick sinkhead tops are ordinarily used but once, since theyusually crack from the heat of the molten metal, and are, in fact, as arule bound by wires to withstand even a single heat.

In addition types of sinkhead tops have been used, who include sand,slag or similar refractory ma-, terial rammed into a frame and dried,and for a single heat only; since part of such refractory materialusually sticks to the metal surface of the ingot and the drying orslightly baked sand, slag or refractory mixture is too weak to withstandthe stresses and strains caused therein when such a sinkhead top islifted off the ingot.

The ob ects of the present improvements are to reduce the cost of usingbrick sinkhead tops, by providing a construction that may be easilystripped from the ingot without being materially damaged and which maybe repetitively used many times with only a small amount of patchingbetween pours; and to provide a sinkhead top convenient to make and use.

These and ancillary objects are attained by the use ofan externalmetallic frame for the sinkhead top, a permanent refractory to bricksinkhead tops, other h ings forming part hereof, in whichof a taperedtube lining for the frame which may be hard baked fire-brick or .arammed and hard baked refractory mixture, such as is used for themanufacture of hard bricks or any mixture, which upon baking will becomehard enough to withstand rough handling and heating and cooling withoutcracking, and a renewable inner lining for the permanent refractorylining to protect the permancnt lining from the action of molten metaland to make a tight joint between the sinkhead top and the mold; a

This renewable inner lining for the'sink-' head top usually must bepatched or renewed after each pour and is therefore preferably made of amaterial which may be coated upon the permanent lining while the latteris still hot, in order to dry thoroughly the renewable lining.

The renewable lining is preferably adapted for convenient application bya brush or trowel for protecting the permanent lining and sealing thejoint between the sinkhead and ingot mold.

Practical embodiments of the invention are illustrated in theaccompanying draw- Figure 1 is a top plan view of one form of theimproved sinkhead as in use upon an ingot mold; Fig. 2, a vertical crosssection thereof as on line 2-2, Fig. 1;

Fig. 3, a top plan view of a modified form of the invention as in useupon an ingot mold; and

Fig, 4, a fragmentary vertical cross section thereof as on line 4-4,Fig. '3, indicating in cross section a cooled ingot poured therein.

Similar numerals refer to similar parts throughout the drawings.

The improved sinkhead illustrated in Figs. 1 and 2 includes a metallicframe 1 for resting on the upper edge of the ingot mold, which frame maybe made of solid cast iron or steel and which is preferably in the .formhaving a relatively small top opening 2 provided with an inwardly anddownwardly extending angular peripheral flange 3, and abottom opening 4lar er ing.

than the top opening 2 and provided with an outwardly extendmgperipheral flange 5 having apertures 6 therein for removable connectionwith a bottom flange ring 7 by means of bolts 8 passing throughctheapertures 6 of the tube bottom flange and countersunk apertures 9 in theflange ring.

The flange ring 7 is provided with an upwardly extending peripheral leg10 and the top flange 3 is provided with a downwardly extendingperipheral leg 3. Permanent fire brick lining 11, provided with upperand lower rabbeted ends 11' and 11" may thus be removably secured bylegs 3 and 10 interfitt-ing with the end rabbets of the firebrick.

Upon a horizontal axis located approximately at the center of gravity ofthe sinkhead top, a pair of socket tru'nnions 12 are rovided forconvenient handling and turning over of the sinkhead top in use and forinspection and repair.

The permanent fire brick lining 11, as above described, forms a taperingtubular continuation of the mold 13. The insides of this permanent hardfire brick lining are coated all over with a renewable lining 14 toprotect the permanent lining from the destructive action of moltenmetal, and also to make a tight joint as at 15 between the sinkhead topand the mold.

Tliis renewable inner lining which may be patched or renewed after eachheat, is preferably made of material adapted for coating with a brush ortrowel upon the permanent linin while the latter is still hot in orderto ry thoroughly the renewable lin- The renewable lining is preferablyofa sufliciently refractory nature so as not to fuse or flux at all, but aless refractory material may be used by spreading the same upon theinside of the permanent lining in layers sufliciently thick so that anysurface fusing of the renewable lining and adhesion to the ingot metalwill not cause a fusing through the renewable lining to thepermanentlining.

The renewable lining material is also preferably adapted to becomesufliciently hard by drying to resist crumbling tendencies, but at thesame time. remain soft enough under the influence of the heat of theingot metal to allow for the stripping of the sinkhead top with itspermanent lining without injury to the latter.

Clay, plumbago, magnesite, chrome-ore, with or without a suitablebinder, such as waterglass, are perfectly suitable for use as materialfor the renewable lining, but it has been found that a renewable liningmixture including fine silica sand and/or cement and/or finely groundbrick-bats, preferably silica brick-bats, and dilute waterglass, is acheap and satisfactory combination.

This mixture is coated upon the insides of thepermanent liningwlth a,brush or trowel, while the sinkhead top is still hot enough to evaporateall the moisture, then some of the mixture is s read on the bottom edgeand under side of t 1e permanent lining, levelin off with the bottomflange ring, and the sin head top is then immediately, and preferablywhile the mixture on the bottom side is still plastic, laced upon themold, thus making a per ect joint, and left to dry in place.

The modified sinkhead top illustrated in Figs. 3 and 4 includes ametallic frame 21 which may be of solid cast iron or steel, and which ispreferably in the form of a tapered tube having a relatively small topopening 22 provided with an inwardly extending pc i heral flange 23, anda bottom 7' lar to "the above described material for the lining 14 andapplied in a similar manner, is provided for the inside of the permanentlining 26. 1

The depth of the renewable lining 27 tapers from a minimum near the topopening of the sinkhead top to a maximumat the joint between thesinkhead top and the-mold and projects downward as at 28 below thehorizontal level 29 of the joint and outward as at 30 between the top ofthe ingot mold and the permanent lining 26 which preferably extendsinward beyond the bottom peripheral flange as at 30.

This arrangement of the renewable lining is provided forafi'ordingmaximum protection to the bottom part of the permanent lining and toform a tight joint between the ingot mold and the sinkhead top.

, I claim 1. A sinkhead top for ingot, molds, including a metal framefor resting on the upper edge of the ingot mold, permanent refractorylinin for the frame, anda renewable inner lining for the permanentrefractory lining.

2. A sinkhead top for ingot molds, including a metal frame for restingon the u per edge of the ingot mold, permanent re actory lining for theframe, and a renewable inner linin for the permanent refractory lining,the inner lining having a maximum i rpeee ere cross section at the lowered e of the sinke portion of the length of the treme, end heed top forresting upon t e in ot mold. the renewable linin extending over the per-10 3. A sinkheed top for ingot moi s inciudmenent lining on ugon theportions of ing e metal freme for restlng on the upper the frame notprovide with the permanent 5 edge of the ingot mold, permanentret'reclining.

tory lining for the frame, and a renewable In testimony that I claim theabove, I inner lining for the permanent refractory have hereuntosubscribed in name. lining, the permanent lining extending for MAX R. TEMBOUR.

